And About Stone Mountain in Georgia...

 It is the largest existing confederate monument, and yet some of the confederate imagery has been removed to a less visible site.

The Atlanta Journal headline:

 

"Stone Mountain Park relocates Confederate flags ahead of holiday"

 

HERE is the story.

The flags got there originally the same as many other symbols of the confederacy: 

"The Confederate flags, donated by the United Daughters of the Confederacy, went up in the early 1960s.

 More about the founding of that group in 1896 HERE.

 Most of the monuments and statues they helped install were done decades after the Civil War. In fact  the approaching U.S. Civil Rights movement seems to have increased the activity in the  early 1900's.